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River Suir
River Suir at Holycross
Origin	Devil's Bit Mountain, County Tipperary
Mouth	Celtic Sea at Waterford

The River Suir (IPA: [ʃuːr], Irish An tSiúr or Abhainn na Siúire) is a river in Ireland that flows into the Atlantic Ocean near Waterford after a distance of 183 kilometres (114 miles). Popular with anglers, it holds plentiful reserves of brown trout and salmon.^{[citation needed]}

Rising on the slopes of Devil's Bit Mountain, just north of Templemore in County Tipperary, the Suir flows south through Loughmore, Thurles, Holycross, Golden and Knockgraffon. Merging with the River Aherlow at Kilmoyler and further on with the Tar, it turns east at the Comeragh Mountains, forming the border between County Waterford and County Kilkenny. It then passes through Cahir, Clonmel and Carrick-on-Suir before reaching Waterford. Here, it meets the River Barrow and the River Nore to form a wide navigable estuary, capable of accommodating seagoing vessels.

Together with the River Nore and the River Barrow, the river is one of the trio known as The Three Sisters.

The Suir is known in Irish as the Siúr and it is thought the present spelling in English with the u and i reversed is due to a mistake. Some people therefore feel that the spelling in English should be Siur and this spelling is occasionally seen.^{[citation needed]}. Edmund Spenser (1552-1599), author of the The Fairie Queene, in his writings during the Elizabethan age while domiciled in County Cork, referred to the 'gentle Shure', probable a most accurate spelling and the most phonetically correct of the period.

In the early years of the 21st century, the remains of a very large Viking settlement were found at a bend in the river just upstream from Waterford.

In Clonmel, the Suir floods the local area after very heavy rainfalls. The Gashouse Bridge, Coleville Road, Coleville Avenue, Waterford Road and the Old Bridge are the most commonly affected areas.

Where the river flows through south County Kilkenny, and near the town of Mooncoin, one of the most famous Irish ballads was written called The Rose of Mooncoin which includes the lines "On the banks of the Suir, that flows down by Mooncoin".